Perennial zones 5-9. One of the most well-known and popular ornamental grasses. Easy to grow from seed. Will thrive in almost any type of soil, even poor dry soil. Blooms summer through fall and the purple frothiness of the flowers look their best when planted in-mass, exceptionally beautiful when put near yellow flowers.likes full sun or partial shade. 20 inches tall and 18 inches wide. Easy to grow from seed. Can be started indoors in winter to be transplanted outdoors in spring or can be sown directly into the ground in spring, summer or fall (4 weeks before first hard frost).